Indução da tolerância à dessecação e ao armazenamento de sementes de Alibertia edulis (Rich.) A. Rich. ex DC.

Abstract

The Brazilian Savanna has by human actions, becoming necessary stidies on conservation of seeds and plant propagating of its plant species. The objective of this work was to induce tolerance to desiccation and storing seeds of Alibertia edulis (Rich.) A. Rich. ex DC. by priming with polyethylene glycol (PEG) and abscisic acid (ABA). The seeds were submitted to, by 120 hours, osmotic treatment with PEG in concentrations of -1.48 and -2.04 MPa, associated or not to ABA (100μM). The seeds that were not subjected to the treatments were constituted control and both The seeds that were not subjected to the treatments were constituted control and both they were dehydrated by fast and slow drying, with reduction of water content of 10 percentual points, later wrapped in foil packaging, kept in cold storage for 0, 30, 60, 90, 120, 150 and 180 days. In each storage time corresponding the seeds were pre- humidified and evaluated about physiological potential by primary radicle protrusion tests, percentage of normal seedlings, germination speed index, length of seedlings (shoot, primary root and total) and total dry mass. The experimental desing used was the completely randomized design in factorial 5 x 7 (5 treatmentas x 7 storage time), with four replicates of 25 seeds. All variables were submitted to analysis of variance, using the SISVAR program. Alibertia edulis seeds are tolerant to storage for 180 days without induction off tolerance to desiccation with polyethylene glycol associated or not with abscisic acid. The use of osmotic potential treatments of -0,73 and -1,48 MPa abscisic association without providing greater increase in seedling growth and accumulation off fresh biomass, heher than in normal conditions (whithout treatment).